Engine-sizing for paper



UNITED STATES PATENT OFFICE.

JUDSON A. DE CEW, OI MOUNT VERNON, NEW YORK, ASSIGNOR TO PROCESS ENGI- NEERS INCORPORATED, 011 NEW YORK, N. Y.

ENGINE-SIZING FOR PAPER.

1T0 Drawing.

and useful Improvements in Engine-Sizing for Paper, of which the following is a specification.

This invention relates to the sizing of paper pulp in the beating engine and it consists essentially in coagulating resin with alum in the presence of a coagulated colloid.

The ordinary process of sizing paper pulp "in the beating engine consists 1n adding a rosin soap to the paper pulp and then coagulating this by means of sulfate of aluminum, or alum.

I have discovered that the properties of this rosin and alumina precipitate are altered and improved if a coagulation of other colloidal materials takes place in the presence of one of these ingredients and beore the other is added.

The method I prefer to follow in obtaining this result is to bring the rosin soap to a dilute solution in water in the presence of mucilaginous material, and an agent v matters ba which has a coagulating efl'ect upon the mucllaginous roduct. I Emamplarosin soap containing about 2% of glue is dissolved in water to form a 1% solution of rosin, and sufiicient formaldehyde is added to make the glue in-' soluble in the water. This mixture is then added tothe paper stock in the beating engine where the rosin soap is coagulated by the sulfate of aluminum.

Another way to carry out this process is to add the rosin sizeand mucilaginous material to the beating engine where the will be dissolved and mixed together an then to coagulate first the mucilaginous or gluey the addition of formaldehyde solution an then to rosin size with alum.

The result of this process is a mixture of Specification of Letters Iatent.

Patented Dec. 2'7, 1921.

Application filed August 24, 1921. Serial No. 495,097.

sizing materials which will resist the injury to sizing usually experienced in machine drying, and which will give a better finish to the paper. By mucilaginous materials, I mean glue, gelatin, casein, starch products,

natural gums in the paper stock, and the like.

Whereas I have mentioned formaldehyde as the coagulatin agent I may use tanning substances, or 0t er coagulating agents so long as" they coagulate the mucilaginous or colloidal substances but do not precipitate the size.

What I claim is:

1. A paper size consisting of a dilute solution of rosin soap in water containing a colloidal material coagulated therein.

2. A paper size consisting of an approximately 1% solution of rosin soap, glue and formaldehyde in water.

3. A process of making a paper size which consists in dissolving a rosin soap and a colloidal material into water and then adding a product which will coagulate the colloidal material and not the soap.

4. A process for making a paper size which consists in making a dilute solution of rosin soap containing glue and adding sufiicient formaldehyde to render the glue insoluble.

5. A paper size which consists of a rosin soap containing a non-resinous colloidal material, in a highly diluted aqueous solution, the colloidal material having been coagulated while in the dilute condition.

6. A process of making a paper size which consists in dissolving a rosin soap and a colloidal material into water to form a dilute solution and then adding a reagent which will coagulate only the non-resinous material.

In testimony whereof I have afiixed my signature to this s ecification.

J SON A. DE CEIV. 

